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36 papers · 2 filters
Early-type stars in the core of the young open cluster Westerlund2
G. Rauw, J. Manfroid, E. Gosset +5
Aims. The properties of the early-type stars in the core of the Westerlund2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet bi…
Deconvolution of HST images of the Cloverleaf gravitational lens : detection of the lensing galaxy and a partial Einstein ring
Virginie Chantry, Pierre Magain
Archival HST/NICMOS-2 images of the Cloverleaf gravitational lens (H1413+117), a quadruply imaged quasar, have been analysed with a new method derived from the MCS deconvolution al…
Instability strips of main sequence B stars: a parametric study of iron enhancement
A. Miglio, P. -O. Bourge, J. Montalban +1
The discovery of beta Cephei stars in low metallicity environments, as well as the difficulty to theoretically explain the excitation of the pulsation modes observed in some beta C…
Non-thermal radio emission from O-type stars. II. HD 167971
R. Blomme, M. De Becker, M. C. Runacres +2
HD 167971 is a triple system consisting of a 3.3-day eclipsing binary (O5-8 V + O5-8 V) and an O8 supergiant. It is also a well known non-thermal radio emitter. We observed the rad…
Towards an understanding of the Of?p star HD191612: Phase-resolved multiwavelength observations
Yael Naze, Gregor Rauw, A. M. T. Pollock +2
We present the analysis of phase-resolved X-ray and optical observations of the peculiar hot star HD191612 (Of?p). This star is known to display line-profile variations that are re…
Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture
A. Miglio, J. Montalban, M. -A. Dupret
The discovery of Cephei stars in low metallicity environments, as well as the difficulty in theoretically explaining the excitation of the pulsation modes observed in some …